FileChooserDialog.java 文件源码

@SuppressWarnings("ConstantConditions")
@NonNull
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M &&
            ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.READ_EXTERNAL_STORAGE) !=
                    PackageManager.PERMISSION_GRANTED) {
        return new MaterialDialog.Builder(getActivity())
                .title(R.string.md_error_label)
                .content(R.string.md_storage_perm_error)
                .positiveText(android.R.string.ok)
                .build();
    }

    if (getArguments() == null || !getArguments().containsKey("builder"))
        throw new IllegalStateException("You must create a FileChooserDialog using the Builder.");
    if (!getArguments().containsKey("current_path"))
        getArguments().putString("current_path", getBuilder().initialPath);
    parentFolder = new File(getArguments().getString("current_path"));
    checkIfCanGoUp();
    parentContents = listFiles(getBuilder().mimeType, getBuilder().extensions);
    return new MaterialDialog.Builder(getActivity())
            .title(parentFolder.getAbsolutePath())
            .items(getContentsArray())
            .itemsCallback(this)
            .onNegative(new MaterialDialog.SingleButtonCallback() {
                @Override
                public void onClick(@NonNull MaterialDialog dialog, @NonNull DialogAction which) {
                    dialog.dismiss();
                }
            })
            .autoDismiss(false)
            .negativeText(getBuilder().cancelButton)
            .build();
}